First session of vibe coding the UI

src/main/java/net/metaunix/openwebfx/App.java

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+package net.metaunix.openwebfx;
+
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+
+public class App extends Application {
+
+    @Override
+    public void start(Stage stage) throws Exception {
+        FXMLLoader loader = new FXMLLoader(
+                getClass().getResource("/net/metaunix/openwebfx/main-view.fxml")
+        );
+
+        Scene scene = new Scene(loader.load(), 1000, 700);
+        stage.setTitle("Open-WebUI Client");
+        stage.setScene(scene);
+        stage.show();
+    }
+
+    public static void main(String[] args) {
+        launch();
+    }
+
+}

src/main/java/net/metaunix/openwebfx/controller/MainController.java

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+package net.metaunix.openwebfx.controller;
+
+import net.metaunix.openwebfx.model.ChatModel;
+import net.metaunix.openwebfx.service.OpenWebUIService;
+import javafx.application.Platform;
+import javafx.fxml.FXML;
+import javafx.scene.Scene;
+import javafx.scene.control.*;
+import javafx.scene.layout.BorderPane;
+import javafx.scene.input.KeyCode;
+import javafx.scene.layout.VBox;
+import javafx.scene.layout.HBox;
+import javafx.geometry.Insets;
+import javafx.geometry.Pos;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+public class MainController {
+
+    @FXML private TextArea inputField;
+    @FXML private Button sendButton;
+    @FXML private VBox chatContainer;
+    @FXML private ScrollPane chatScrollPane;
+    @FXML private CheckBox darkModeToggle;
+
+    @FXML private BorderPane root;
+
+    private final ChatModel model = new ChatModel();
+    private final ExecutorService executor = Executors.newSingleThreadExecutor();
+
+    // CHANGE THESE
+    private final OpenWebUIService service =
+            new OpenWebUIService("http://localhost:3000", "YOUR_API_KEY");
+
+    @FXML
+    private void initialize() {
+
+        // Apply dark/light mode once scene is ready
+        root.sceneProperty().addListener((obs, oldScene, newScene) -> {
+            if (newScene != null) {
+                applyDarkMode(darkModeToggle.isSelected());
+            }
+        });
+
+        // Toggle listener for user changes
+        darkModeToggle.selectedProperty().addListener((obs, oldVal, newVal) -> {
+            applyDarkMode(newVal);
+        });
+
+        // Key handler for sending messages
+        inputField.setOnKeyPressed(event -> {
+            if (event.getCode() == KeyCode.ENTER && !event.isShiftDown()) {
+                event.consume();
+                handleSend();
+            }
+        });
+    }
+
+    // Method to apply dark or light mode
+    private void applyDarkMode(boolean dark) {
+        Scene scene = root.getScene();
+        if (scene == null) return;
+
+        scene.getStylesheets().clear();
+
+        // Always add base
+        scene.getStylesheets().add(getClass()
+            .getResource("/net/metaunix/openwebfx/style.css")
+            .toExternalForm());
+
+        // Then theme
+        if (dark) {
+            scene.getStylesheets().add(getClass()
+                .getResource("/net/metaunix/openwebfx/style-dark.css")
+                .toExternalForm());
+        } else {
+            scene.getStylesheets().add(getClass()
+                .getResource("/net/metaunix/openwebfx/style-light.css")
+                .toExternalForm());
+        }
+    }
+
+    private void addMessage(String text, boolean isUser) {
+        Label label = new Label(text);
+        label.setWrapText(true);
+        label.setMaxWidth(500);
+
+        VBox bubble = new VBox(label);
+        bubble.setPadding(new Insets(10));
+        bubble.setStyle(
+                isUser
+                        ? "-fx-background-color: #2563eb; -fx-background-radius: 15;"
+                        : "-fx-background-color: #2d2d2d; -fx-background-radius: 15;"
+        );
+
+        label.setStyle("-fx-text-fill: white;");
+
+        HBox wrapper = new HBox(bubble);
+        wrapper.setPadding(new Insets(5));
+
+        if (isUser) {
+            wrapper.setAlignment(Pos.CENTER_RIGHT);
+        } else {
+            wrapper.setAlignment(Pos.CENTER_LEFT);
+        }
+
+        chatContainer.getChildren().add(wrapper);
+
+        Platform.runLater(() ->
+                chatScrollPane.setVvalue(1.0)
+        );
+    }
+
+    @FXML
+    private void handleSend() {
+
+        String userMessage = inputField.getText().trim();
+        if (userMessage.isEmpty()) {
+            return;
+        }
+
+        // Add user bubble
+        addMessage(userMessage, true);
+
+        // Clear input + disable send while processing
+        inputField.clear();
+        sendButton.setDisable(true);
+
+        executor.submit(() -> {
+            try {
+
+                String response = service.sendMessage(userMessage);
+
+                Platform.runLater(() -> {
+                    addMessage(response, false);
+                    sendButton.setDisable(false);
+                    inputField.requestFocus();
+                });
+
+            } catch (Exception e) {
+
+                Platform.runLater(() -> {
+                    addMessage("⚠ Error: " + e.getMessage(), false);
+                    sendButton.setDisable(false);
+                });
+            }
+        });
+    }
+}

src/main/java/net/metaunix/openwebfx/model/ChatModel.java

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+package net.metaunix.openwebfx.model;
+
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+
+public class ChatModel {
+
+    private final ObservableList<String> messages = FXCollections.observableArrayList();
+
+    public ObservableList<String> getMessages() {
+        return messages;
+    }
+
+    public void addMessage(String message) {
+        messages.add(message);
+    }
+}

src/main/java/net/metaunix/openwebfx/service/OpenWebUIService.java

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+package net.metaunix.openwebfx.service;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+
+public class OpenWebUIService {
+
+    private final String baseUrl;
+    private final String apiKey;
+    private final HttpClient client = HttpClient.newHttpClient();
+    private final ObjectMapper mapper = new ObjectMapper();
+
+    public OpenWebUIService(String baseUrl, String apiKey) {
+        this.baseUrl = baseUrl;
+        this.apiKey = apiKey;
+    }
+
+    public String sendMessage(String message) throws Exception {
+
+        String requestBody = """
+        {
+          "model": "gpt-4o-mini",
+          "messages": [
+            {"role": "user", "content": "%s"}
+          ]
+        }
+        """.formatted(message.replace("\"", "\\\""));
+
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(URI.create(baseUrl + "/v1/chat/completions"))
+                .header("Content-Type", "application/json")
+                .header("Authorization", "Bearer " + apiKey)
+                .POST(HttpRequest.BodyPublishers.ofString(requestBody))
+                .build();
+
+        HttpResponse<String> response =
+                client.send(request, HttpResponse.BodyHandlers.ofString());
+
+        JsonNode root = mapper.readTree(response.body());
+        return root.get("choices")
+                .get(0)
+                .get("message")
+                .get("content")
+                .asText();
+    }
+}

src/main/resources/net/metaunix/openwebfx/main-view.fxml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.*?>
+
+<BorderPane fx:id="root"
+            xmlns:fx="http://javafx.com/fxml"
+            fx:controller="net.metaunix.openwebfx.controller.MainController"
+            styleClass="root">
+
+    <!-- LEFT SIDEBAR -->
+    <left>
+        <VBox prefWidth="220" styleClass="sidebar">
+            <Label text="Conversations" styleClass="sidebar-title"/>
+
+            <ListView fx:id="conversationList"
+                      VBox.vgrow="ALWAYS"/>
+        </VBox>
+    </left>
+
+    <!-- TOP BAR -->
+    <top>
+        <HBox alignment="CENTER_LEFT" spacing="10" styleClass="topbar">
+            <padding>
+                <Insets top="10" right="15" bottom="10" left="15"/>
+            </padding>
+
+            <Label text="OpenWebFX" styleClass="app-title"/>
+
+            <Region HBox.hgrow="ALWAYS"/>
+
+            <ComboBox fx:id="modelSelector"
+                      prefWidth="180"/>
+
+            <!-- Dark/Light Mode Switch -->
+            <CheckBox fx:id="darkModeToggle" text="Dark Mode" selected="false"/>
+        </HBox>
+    </top>
+
+    <!-- CHAT AREA -->
+    <center>
+        <ScrollPane fx:id="chatScrollPane"
+                    fitToWidth="true"
+                    styleClass="chat-scroll">
+
+            <VBox fx:id="chatContainer"
+                  spacing="15"
+                  styleClass="chat-container">
+                <padding>
+                    <Insets top="20" right="20" bottom="20" left="20"/>
+                </padding>
+            </VBox>
+
+        </ScrollPane>
+    </center>
+
+    <!-- INPUT AREA -->
+    <bottom>
+        <HBox fx:id="bottomControls"
+            spacing="10" styleClass="input-area">
+            <padding>
+                <Insets top="10" right="20" bottom="20" left="20"/>
+            </padding>
+
+            <HBox spacing="10" alignment="CENTER" HBox.hgrow="ALWAYS">
+                <TextArea fx:id="inputField"
+                      prefRowCount="2"
+                      wrapText="true"
+                      HBox.hgrow="ALWAYS"
+                      promptText="Send a message..."/>
+                <Button fx:id="sendButton" text="Send" HBox.hgrow="ALWAYS" maxWidth="Infinity" maxHeight="Infinity"/>
+            </HBox>
+        </HBox>
+    </bottom>
+
+</BorderPane>

src/main/resources/net/metaunix/openwebfx/style-dark.css

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+/* Backgrounds */
+.root, #chatContainer, #conversationListContainer, #bottomControls {
+    -fx-background-color: #1e1e1e;
+}
+
+.text-area, #chatListView, #conversationList {
+    -fx-background-color: #2b2b2b;
+    -fx-text-fill: white;
+}
+
+/* Title color */
+.app-title {
+    -fx-text-fill: white;
+}
+
+/* Send button - green */
+.send-button {
+    -fx-background-color: #10b981; /* same green as light mode */
+    -fx-text-fill: white;
+}

src/main/resources/net/metaunix/openwebfx/style-light.css

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+/* Backgrounds */
+.root, #chatContainer, #conversationListContainer, #bottomControls {
+    -fx-background-color: #f5f5f5;
+}
+
+.text-area, #chatListView, #conversationList {
+    -fx-background-color: #ffffff;
+    -fx-text-fill: black;
+}
+
+/* Title color */
+.app-title {
+    -fx-text-fill: black;
+}
+
+/* Send button - green */
+.send-button {
+    -fx-background-color: #10b981; /* nice green */
+    -fx-text-fill: white;
+}

src/main/resources/net/metaunix/openwebfx/style.css

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+/* Backgrounds */
+.root, #chatContainer, #conversationListContainer, #bottomControls {
+    -fx-background-color: #f5f5f5;
+}
+
+.text-area, #chatListView, #conversationList {
+    -fx-background-color: #ffffff;
+    -fx-text-fill: black;
+}
+
+/* Title color */
+.app-title {
+    -fx-text-fill: black;
+}
+
+/* Send button - green */
+.send-button {
+    -fx-background-color: #10b981; /* nice green */
+    -fx-text-fill: white;
+}